ON THE PERIODICITY OP THE AURORA BOREA1IS. 



23 



1G30. Feb. 3. Joachim. Lehmann. 



" " 3. Frobes, Mairan, and Acad. Coll. 



" " 4. Spilzbergen. Boue, Mairan, Acad. 



" " 4. Tubingen. Schickard, Frobes, Kirch. 



" June 18. Pfeff, Boguslawski, Boue. 



" " 19. Plaff, Boguslawski, Boue. [bow. 



1732. Nov. 12. 1 Paris. Godin. Copenhagen. Ilorre- 



1633. May 28. Lehmann, Frobes, M., and A. C. 



" June 23. Lehmann, Frobes, M., and A. C. 



" Dec. 30. Spilzbergen. Zorgdrager. 2 



" " 30. Frobes and Mairan. Acad. Coll. 



1C34. Jan. 3. Spilzbergen. Zorgdrager. 



" " 3. Frobes, Mairan, and Acad. Coll. 



" Feb. 1. Spitsbergen. Zorgdrager. 



" " 1. Frobes, Mairan, and Acad. Coll. 



" " 11. Wolckenslein. Lehmann. Frobes. M. 



1G37. Aug. 20. Meissen and Bohemia. Lehmann. 



" '' 20. Frobes, Mairan, and Acad. Coll. 



1C38. Jan. C. Meissen and Bohemia. Lehmann. 



" " 6. Frobes, Mairan, and Acad. Coll. 



1640. Jan. 27. Lehmann, Frobes, Mairan, and 



1643. Nov. 8. Boguslawski. 8 Boue. [Acad. Coll. 



" " x. Saxony. Franciscus, Lehmann, F. 



1G44. Mar. x. Annaberg, Saxony. Lehmann, F. 



164."). April 27. JDuncke/spield. Franciscus. 



" " 27. Frobes, Mairan, and Acad. Coll. 



1G46. Nov. x. Silesia. Franciscus. 



" " x. Frobes, Mairan, and Acad. Coll. 



1650.? Jan. 17. Basle. AVagner. 



" " 17. Frobes, Mairan, and Acad. Coll. 



1654. Mar. 5. Leipsic. Franciscus. 



'• " 5. Frobes, 4 Mairan, and Acad. Coll. 



1655. July 9. Poland. Tylkowsky. 



" " 9. Frobes, Mairan, and Acad. Coll. 



1757. Jan. 13. Kirch, Mairan, and Acad. Coll. 



" April 13. Meissen. Lehmann. 



" " 13. Frobes, Mairan, and Acad. Coll. 



1660. Dec. x. Hungary. Lehmann. Frobes. 



1661. Jan. 30. Glarus and Vadisvilla. Wagner. 6 

 " " 30. Frobes, Mairan, and Acad. Coll. 



" April 16. Prussia. Schulzius. Franciscus. 



" " 16. Frobes, Mairan, and Acad. Coll. 



1662. Dec. 15. Scheibenberg. Lehmann. 



" " 15. Frobes, Mairan, and Acad. Coll. 



16G3. Nov. 9. Scheibenberg. Lehmann. 



i Encyc. Method. I. 453. 



• De Piscatn Greenland, Leipsic, 1723, p. 320. 



« Schlcs. Chron., Nov. 12, 1841. 



4 Limner. 1>l- Nundin. Lips. Relat. 



6 This was probably a meteor. 



1663. Nov. 9. Frobes, Mairan, and Acad. Coll. 



1664. April 18. Scheibenberg. Lehmann. 



" " 18. Frobes, Mairan, and Acad. Coll. 



1665. April 18. Baltic Sea. Scheffer. Franciscus. 

 " " 18. Frobes, Mairan, and Acad. Coll. 



" Aug. 23. Upsal. Celsius. Frobes, Mairan, 1 



1666. Jan. 31. Scheibenberg. Lehmann. [A. Coll. 

 " " 31. Frobes, Mairan, and Acad. Coll. 



1671. Nov. 29. Bischofszell, Sivitz. Wagner. 



" " 29. Frobes, Mairan, and Acad. Coll. 



1672. Jan. x. Cracow. Cromerus. 



" " x. Frobes, Mairan, 1 and Acad. Coll. 



1676? Feb. 3. Zurich. Frobes, Mairan, Acad. C. 



" Mar. 2.? Zurich. Frobes, Mairan, Acad. Coll. 



1677. Nov. 18. Rostock. Franciscus. 



" " 18. Frobes, Mairan, and Acad. Coll. 



" Dec. 12. Annaberg, Saxony. Lehmann. 



" " 12. Frobes, Mairan, and Acad. Coll. 



1680. Sept. 30. Chemnitz. Lehmann. 



" " 30. Frobes, Mairan and Acad. Coll. 



1682. Nov. 7. Dantzig. llevelius. 8 



" " 7. Frobes, Mairan, and Acad. Coll. 



" Dec. 15. Meissen.? Waldsehinidt. 4 Lehmann. 



" " 15. Frobes, Mairan, and Acad. Coll. 



1683. Jan. x. Frobes, Mairan, and Acad. Coll. 



" Aug. 22. Germany. Weigelius, 6 Lehmann. 



" " 22. Frobes, Mairan, and Acad. Coll. 



1684. Mar. 28. Meissen. Lehmann. 6 



" " 28. Frobes, Mairan, and Acad. Coll. 



" Nov. 23. Meissen. Lehmann. 



" " 23. Frobes, Mairan, and Acad. Coll. 



1685. April 26.? Lehmann, Frobes, Mairan, A. C. 



1686. Feb. 2. Milfelhcim. Moeren. 7 Frobes. 



" " 2. Mairan, Pilgrara, and Acad. Coll. 



" June 1. Mairan, Short, and Acad. Coll. 



" July 19. Mairan, Short, and Acad. Coll. 



" Oct. 29. Meissen. Vulpius. Guettner. 8 



" " 29. Frobes, Mairan, and Acad. Coll. 

 1687.?° Denmark. Horrebow. Pilgram, Mairan. 



1 Acta Lit. Suecix. II. 50. 



2 Mairan understands Frobes as meaning Jan. 1073. 

 8 ActaKrudii. Leipsic, 1682, p. 391 ct 1685, p. 141. 

 4 Diss. Meteori Ignei in Acre nuper conspecti, &c. 



6 Von der Wiirkung des Gemuths, &C. 



6 This and tlie supposed aurora of Nov. 23 were probably 

 meteors. 



1 Misccll. Curiosa. 1686. VII. 215. ? 



8 Acta Eruditaet Curiosa. XX. 716. 



,J Cassini states that the aurora appeared at the end of June 

 and continued till July 10. Encyc. Method. — Physique, I. 352. 

 Also Traite &.C. par Mairan, pp. 35 ct 203. 



